Simplify. Express your answer in standard form.(n6 + 13) + (7n5 + 18n4 - 5) - (9n5 - 18n4 + 20)
A. n6 - 2n5 + 36n4 - 12
B. 22n9
C. n6 - 2n5 + 36n4 + 28
D. n6 - 2n5 + 27n4 + 28
Answer: A
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